Image of an electric haul truck in the Berkeley Pit, which used a diesel motor to maneuver around the shovels and the dumps. Note the trolley and wires. This model of truck was not successful in Butte.

Image of an electric haul truck in the Berkeley Pit, which used a diesel motor to maneuver around the shovels and the dumps. Note the trolley and wires. This model of truck was not successful in Butte.

Image of an electric haul truck in the Berkeley Pit, which used a diesel motor to maneuver around the shovels and the dumps. Note the trolley and wires. This model of truck was not successful in Butte.

Image of an electric haul truck in the Berkeley Pit, which used a diesel motor to maneuver around the shovels and the dumps. Note the trolley and wires. This model of truck was not successful in Butte.

Image of an electric haul truck in the Berkeley Pit, which used a diesel motor to maneuver around the shovels and the dumps. Note the trolley and wires. This model of truck was not successful in Butte.

Image of a group of workers at the Berkeley Pit. Individuals listed, as follows, third from the left, back row: L. Gilbert, Frank Connell, and Bill Steyh; front row, second from the left is Rudy Richter.

Image of an electric truck in the Berkeley Pit open pit mine. The mine belonged to the Anaconda Copper Mining Company and was later was purchased by the Atlantic Richfield Company (ARCO). The man standing has been identified as John Killoy, the...